DAIRYING 33 



fat is of the pounds of butter fat in the milk or cream started with. 

 If 1000 pounds of milk testing 3.5 per cent, fat gives 40.6 pounds 

 butter then the overrun is calculated as follows: 1000 X 3.5%=35 

 pounds butter fat. Then if 40.6 pounds butter is made the increase 

 is 40.6 35=5.6 pounds and this 5.6 pounds is what pen cent of 

 35 pounds (35 :5.6::100:x=16%.) 



443. The overrun from, cream is a few per cent, more than 

 from milk because the losses in skimming are not considered in 

 the cream overrun. If 100 pounds cream testing 35 per cent, fat 

 gives 42 pounds. butter the overrun is calculated as follows: 100 * 

 35%=35 pounds butter fat and this subtracted from the 42 pounds 

 butter leaves 7 Ibs., which is a certain per cent, of the 35 pounds 

 fat in the cream. This may be found in the following way 



Plate 7 Paper Butter Package 



(35:7::io:x=2O%.) An overrun calculation may be made from data 

 obtained in any churning, but it is always necessary to know the 

 pounds of butter fat in the milk or the cream and the pounds of 

 butter made from this butter fat. Unless these two figures are 

 known, the overrun cannot be calculated. 



FARM DAIRY BUTTER PACKAGES. 



444. Wood or paper packages of various shapes and sizes are 

 more satisfactory than any other material used for this purpose. 

 Tin rusts and glass or crocks are generally too heavy for eco- 

 nomical transportation. Crocks make a clean, attractive package 

 so long as no cracks or scars are found on them, but as soon 



